Prioritized call sessions

ABSTRACT

A local network call handling device is configured to establish multiple concurrent call sessions between local network end devices and an external network. When a prioritized end device attempts to establish a call session, the call handling device may initially determine if a first call session identifier is available. If so, the call session can be established using that first identifier. If the first identifier is in use for a call session of another end device, the call handling device may either use a different call session identifier for the prioritized end device session or may drop a pre-existing call session to free an identifier for use in connection with the prioritized end device.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.13/972,165, filed Aug. 21, 2013, which is a continuation of U.S. patentapplication Ser. No. 12/544,551, filed Aug. 20, 2009 (abandoned), eachof which is titled “Prioritized Call Sessions,” and each of which isincorporated by reference herein as to its entirety.

BACKGROUND

It is under some circumstances desirable to give a specific deviceprioritized use of an outgoing communication channel. One example is analarm system in a residence or business. Alarm systems are oftenconfigured to generate an outgoing telephone call to an alarm monitoringcompany or other destination if a break-in, fire or other event triggersthe alarm. Typically, such alarms and other devices in a premises areconnected to a conventional analog telephone line using a RJ31Xconnector or through some other type of hardware-based line seizuredevice. If triggered, the alarm system can seize that telephone line anddrop any other call that might currently be taking place. Although thisarrangement has worked well, it is at best an incomplete solution inother communication environments.

SUMMARY

This Summary is provided to introduce a selection of concepts in asimplified form that are further described below in the DetailedDescription. This Summary is not intended to identify key features oressential features of the invention.

In at least some embodiments, a call handling device in a subscriberpremises has multiple local network interfaces for communication with analarm or other prioritized end device and with other end devices such ascordless handsets. The call handling device further includes aninterface to an external network and is configured to establish multipleconcurrent call sessions between the end devices and the externalnetwork. The call sessions could include voice calls, and may beestablished using multiple telephone numbers or other call sessionidentifiers assigned to the call handling device or to a subscriberaccount with which the call handling device is associated. When theprioritized end device requests that a call session be established, thecall handling device may initially determine if a first of the callsession identifiers is available. If so, the requested call session canbe established using that first identifier. If the first identifier isin use for a call session of another end device, the call handlingdevice may then determine if any of the other call session identifiersis available. If so, one of those other identifiers can be used toestablish the call session for the prioritized end device. If all of theother identifiers are in use for call sessions of other end devices, oneof those call sessions can be dropped and the identifier previously usedfor the dropped session can be used to establish the requested callsession for the prioritized end device.

BRIEF DESCRIPTION OF THE DRAWINGS

Some embodiments are illustrated by way of example, and not by way oflimitation, in the figures of the accompanying drawings and in whichlike reference numerals refer to similar elements.

FIG. 1 is a diagram of an environment in which at least some embodimentsmay be implemented.

FIG. 2 is a block diagram showing additional details of the callhandling device in FIG. 1.

FIG. 3 is a flow chart showing operations performed by a processor, in alocal call handling device according to some embodiments, in response toa request from an alarm system to establish a call session.

FIGS. 4 and 5 are communication diagrams showing establishment of a callsession for an alarm system according to some embodiments.

FIGS. 6A and 6B show operations of a processor, in a local call handlingdevice according to some further embodiments, using SIP signaling.

FIG. 7 is a flow chart showing operations performed by a processor, in alocal call handling device according to some additional embodiments, inresponse to a request from an alarm system to establish a call session.

FIGS. 8A and 8B are flow charts showing operations performed by aprocessor in a local call handling device according to additionalembodiments.

FIG. 9 is a diagram of an environment in which at least some additionalembodiments may be implemented, and showing a local call handling deviceaccording to certain additional embodiments.

FIGS. 10A and 10B are flow charts showing operations performed by aprocessor in the local call handling device of FIG. 9.

FIG. 11 is a diagram of an environment in which at least some additionalembodiments may be implemented, and showing a local call handling deviceaccording to one such additional embodiment.

DETAILED DESCRIPTION

FIG. 1 is a diagram of an environment in which at least some embodimentsmay be implemented. A local network 101 is situated in a subscriberpremises 102. Local network 101 includes a call handling device 103, analarm system 104 and a plurality of handset end devices 105-1 through105-n. Call handling device 103, which is described in more detailbelow, may include components configured to perform operations of anEmbedded Media Terminal Adapter (EMTA), an Embedded Digital VoiceAdapter (EDVA) or another type of local communication gateway.

Call handling device 103 communicates with alarm system 104 over a firstanalog interface 106A and with an analog telephone 107 over a secondanalog interface 106B. In particular, each of interfaces 106A and 106Bpermits conventional analog telephony devices to communicate via callhandling device 103. In the embodiment of FIGS. 1 and 2, each ofinterfaces 106A and 106B includes an RJ-11 connector and a SLIC(Subscriber Line Interface Circuit). The SLIC is connected to ananalog-to-digital converter (ADC) within call handling device 103 thatconverts an analog input signal (e.g., tones or other input from alarmsystem 104, a voice signal from an analog telephone) into digitalsamples prior to sending the input signal to the processor of callhandling device 103. In some embodiments, and as shown in broken lines,a RJ-31X connector 108 (or other type of line seizure device) can beused to connect alarm system 104 and additional analog devices (e.g.,another analog telephone 112) to interface 106A. In this manner,multiple devices can share analog interface 106A, but alarm system 104can (using RJ-31X connector 108) seize interface 106A from telephone 112and other devices sharing interface 106A.

Handset end devices 105-1 through 105-n communicate with call handlingdevice 103 over DECT (Digital Enhanced Cordless Telephone) interface109. Interface 109 includes a wireless transceiver that converts radiosignals received from handsets 105-1 through 105-n into pulse-codemodulated (PCM) signals and provides those signals to the processor ofcall handling device 103. The transceiver similarly converts PCM signalsreceived from that processor into radio communications to handsets 105-1through 105-n.

Call handling device 103 also communicates with an external network 110over a packet data interface 111. In some embodiments, packet datainterface 111 includes a coaxial cable connection over which data iscarried according to one or more specifications of the Data Over CableSystem Interface Specifications (DOCSIS). Call handling device 103establishes call sessions between end devices and external network 110.For example, a user of handset end device 105-1 may wish to establish avoice communication call session with a party at a remote device locatedin (or reachable through) external network 110. In response to userinput, end device 105-1 transmits a signal to call handling device 103indicating a request to establish the call session. Call handling device103 then communicates with one or more elements in external network 110that set up the call session with the called party. In some embodiments,the elements in external network 110 with which call handling device 103communicates to establish call sessions include one or more Cable ModemTermination Systems (CMTS) and/or one or more Call Management Servers(CMS). In still other embodiments, the external network elements withwhich call handling device 103 communicates to establish call sessionsmay include one or more IP Multimedia Subsystem (IMS) elements. In asimilar manner, a party using a device in external network 110 (orcommunicating through external network 110) may attempt to establish acall session with a user at premises 102. Upon receiving communicationsover packet data interface 111 indicating the externally-initiatedattempt to establish a call, call handling device 103 completes the callsession by establishing communication with one or more end devices.

In many cases, a call session may be a voice call session that willappear to the user as a conventional telephone call. For example,external network 110 may be the network of a Multiple Services Operator(MSO) providing cable television (CATV) services, high-speed dataservices and/or Voice over Internet Protocol (VoIP) or other type ofpacket-based telephony services. Other types of call sessions may alsobe established through call handling device 103, however. For example,some call sessions may involve transfer of data used to generate text,graphics or other visually-perceptible material on an end device. Somecall sessions may be primarily one-way communication sessions (e.g.,streaming audio or video).

When establishing a call session, call handling device 103 associatesthe session with a call session identifier. A call session identifiercan be a telephone number (TN) and/or may include other data. Innetworks employing Network-based Call Signaling (NCS) call setup, anidentifier may include a NCS ID that is mapped to a particular telephonenumber. In such a circumstance, the call session might appear to theuser as though it were being carried over a telephone “line”corresponding to that TN. However, the call session would actuallycomprise a collection of data packets that are identified by (orotherwise correspond to) the telephone number and/or other call sessionidentifier. Other simultaneously occurring call sessions would thencomprise other groups of data packets that correspond to different TNs(and/or other type of session identifiers).

In the example of FIG. 1, the operator of network 110 has assigned Ncall session identifiers to the subscriber account associated withpremises 102. As used herein, a “subscriber” is a person, corporation orother entity that has arranged to obtain access to, and one or moreservices from, network 110 and an “account” is a construct used to groupvarious data items related to providing a subscriber with services inthe network. In the current example, the operator of network 110 hasestablished an account for premises 102 and associated that account andits assigned TNs with call handling device 103. This is only oneexample, however, and an account need not be assigned to a particulartype of entity or be associated with a single premises or call handlingdevice.

When a call session is established, one of the TNs assigned to thepremises 102 account (or another call session identifier correspondingto one of the TNs) is used to identify data packets that are part ofthat call session. While that call session is ongoing, and in at leastsome embodiments (e.g., embodiments using NCS signaling), the same TN isnot used in connection with other call sessions. If all of the callsession identifiers are associated with ongoing call sessions when auser or device seeks to establish another call session, no identifierwill be available. Until one of the session identifiers is freed (e.g.,by ending one of the ongoing call sessions), call handling device 103will not establish a new call session.

In theory, the number of concurrent call sessions conducted through acall handling device is only limited by the information carryingcapacity of the connection between a call handling device and anexternal network. As a practical matter, however, there are often otherconstraints on the number of concurrent sessions. For example,increasing the number of concurrent call sessions that can beaccommodated increases the complexity of a call handling device.Increased complexity usually increases device cost. Accordingly,economic concerns may prevent building of call handling devices able toaccommodate more than a few concurrent sessions. Regulatory concernscould also limit the number of concurrent sessions permitted through aparticular call handling device. In some embodiments, the number of callsession identifiers assigned to an account may thus be different fromthe maximum number of concurrent call sessions. As but one example, theoperator of network 110 may assign five call session identifiers to thepremises 102 account (i.e., N=5), but call handling device 103 may onlybe able to accommodate four simultaneous call sessions (e.g., up tothree call sessions using interface 109 and a call session using one ofinterfaces 106A and 106B).

FIG. 2 is a block diagram showing additional details of call handlingdevice 103 from FIG. 1. A main processor 201 is configured to executeinstructions so as to perform various operations as described herein, toperform various DOCSIS MAC and PHY (physical) layer operations, toperform call setup and other call handling procedures in accordance withNCS protocols (as described in PACKETCABLE specifications available fromCable Television Laboratories, Inc. of Louisville, Colo.), and tocontrol operation of other components of call handling device 103.Instructions executed by main processor 201 may be hard-wired logicgates and/or may be instructions read from memory 202. Main processor201 communicates with external network 110 across an interface 111 thatincludes a coaxial cable connector 203, a duplex filter 204, a widebandtuner 205 and an upstream communication amplifier 206. As indicatedabove, call handling device 103 communicates with alarm system 104 overanalog interface 106A, with analog telephone 107 over analog interface106B, and with handsets 105-1 through 105-n over DECT interface 109. Insome embodiments, call handling device 103 may include additionalinterfaces that have hardware and/or firmware that facilitatecommunications with numerous other types of end devices. Such interfacescan include a USB interface, a MOCA (Multimedia Over Coax) interface, a2.4 GHz WiFi interface, a 5 GHz WiFi interface, and/or an Ethernetinterface. A power supply 207 and/or battery backup 208 provideelectrical power. User input to call handling device 103 may be providedfrom an end device over one of the aforementioned interfaces or via aseparate collection of buttons or other controls in a console 209. Inaddition to NCS call setup and handling and other operations describedherein, call handling device 103 could in some embodiments also beconfigured to act as a local gateway for other types of servicesreceived via interface 111 (e.g., CATV or other broadcast videoprogramming, high speed data service, etc.).

Processor 201 is configured to prioritize any communications throughfirst analog interface 106A. In this manner, a prioritized end devicecan be connected to interface 106A and be assured of the ability toestablish a call session. Alarm system 104 is the prioritized end devicein the present example, but this need not be the case. In at least someembodiments, processor 201 associates both first analog interface 106Aand second analog interface 106B with a first NCS ID (or other callsession identifier). Any of handset devices 105-1 through 105-n caninitiate call sessions that use the first NCS ID, however. Thosehandsets may also initiate call sessions that use any of the other NCSIDs available to call handling device 103. Devices communicating throughinterface 106B (telephone 107) can initiate call sessions that use thefirst NCS ID, but cannot initiate call sessions using other NCS IDs.When alarm 104 is triggered, however, any pre-existing call session overinterface 106B will be dropped so that alarm system 104 can use thefirst NCS ID. If there is no pre-existing call session over interface106B but the first NCS ID is being used in a call session for one ofhandsets 105-1 through 105-n, processor 201 will attempt to find anotherNCS ID for use in the prioritized call session that alarm system 104 isinitiating. If no other NCS IDs are free, processor 201 will drop thecall session that is currently utilizing the first NCS ID and allowalarm 104 to use that NCS ID.

FIG. 3 is a flow chart showing operations performed by processor 201 inresponse to a request from alarm system 104 to establish a call session.The algorithm of FIG. 3 assumes that each of the N TNs assigned to thepremises 102 account by the operator of network 110 is mapped to acorresponding NCS ID. In particular, TN1 is mapped to NCS ID1, TN2 ismapped to NCS ID2, . . . , and TNN is mapped to NCS IDN. Moreover, NCSID1 (TN1) is associated with interfaces 106A and 106B. The algorithm ofFIG. 3 further assumes that any of handsets 105-1 through 105-ncommunicating through interface 109 of call handling device 103 can useany of those NCS IDs/TNs that is not currently being used for apre-existing call session.

In block 301, processor 201 receives a signal indicating that a devicecommunicating through analog interface 106A is requesting that a callsession be established. In response, processor 201 proceeds to block 302and determines if a first NCS ID (NCS ID1) is currently in use for anongoing call session. If not, processor 201 proceeds on the “no” branchto block 303 and selects NCS ID1. Processor 201 then proceeds to block313 and establishes a prioritized call session for the end device oninterface 106A using the selected NCS ID. As part of block 313,processor 201 may also disable interface 106B until the prioritized callsession is completed. In this manner, a call session initiated by alarmsystem 104 would not be interrupted if analog telephone 107 were to gooff-hook during that prioritized call session.

If in block 302 processor 201 determines that NCS ID1 is currently inuse, processor 201 proceeds to block 304 on the “yes” branch anddetermines if NCS ID1 is in use for a call session involving a devicecommunicating through second analog interface 106B. If so, processor 201proceeds on the “yes” branch to block 310 (described below). If not,processor 201 proceeds on the “no” branch to block 306 and determines ifthere is another NCS ID assigned to the premises 102 account that is notbeing used for an ongoing call session. If so, processor 201 proceeds toblock 307 on the “yes” branch and selects one of the unused NCS IDs.Processor 201 can make the selection in block 307 based on NCS ID (e.g.,select NCS ID2 if it is free, else select NCS ID3, etc.) or in someother manner. From block 307, processor 201 proceeds to block 313 andestablishes a prioritized call session for the end device on interface106A using the selected NCS ID.

Returning to block 306, processor 201 proceeds on the “no” branch toblock 310 if all other NCS IDs are in use for ongoing sessions. In block310, processor 201 drops the session using NCS ID1. If block 310 isreached from the “no” branch of block 306, a call session is notcurrently occurring through interface 106B, and identifiers NCS ID1through NCS IDN are being used for call sessions by handsetscommunicating through interface 109. In such a case, the user(s) ofhandset(s) in the pre-existing NCS ID1 call session will hear thatsession being interrupted, but pre-existing call sessions using otherNCS IDs will not be affected. If block 310 is reached from the “yes”branch of block 304, the pre-existing NCS ID1 call session could beoccurring (a) solely over interface 106B, or (b) over both of interfaces106B and 109 (e.g., a user of one of handsets 105-1 through 105-n mayhave bridged into a call session initially established over telephone107, or vice versa). In case (a) the user of telephone 107 will hear thepre-existing call session being interrupted, but any call sessionsthrough interface 109 using other NCS IDs will not be affected. In case(b), the user of telephone 107 and users of handset(s) bridged into thepre-existing NCS ID1 call session will hear that session beinginterrupted, but any call sessions through interface 109 using other NCSIDs will not be affected.

After dropping the pre-existing NCS ID1 call session in block 310,processor 201 proceeds to block 312 and selects NCS ID1. From block 312,processor 201 proceeds to block 313 and establishes a prioritized callsession for the end device on interface 106B using the selected NCS ID.

FIG. 4 is a communication diagram showing the establishing of a callsession for alarm system 104 using an NCS ID other than NCS ID1. At line4-1, handset device 105-1 sends a signal to call handling device 103indicating a request to establish a call session using NCS ID1. Callhandling device 103 then establishes that call session, as shown atlines 4-2 and 4-3. While that NCS ID1 call session is ongoing, alarmsystem 104 is triggered and sends a signal to call handling device 103indicating a request to establish a call session (line 4-4). Because thesignal was received over interface 106A (FIG. 2), processor 201 of callhandling device 103 initially associates the signal with NCS ID1 (line4-5). Upon determining that NCS ID1 is in use for another call session,and upon determining that other call session does not involve interface106B, call handling device 103 selects another, unused, NCS ID (NCS ID2)at line 4-6. Using NCS ID2, call handling device 103 establishes a callsession for alarm system 104 at lines 4-7 and 4-8.

FIG. 5 is a communication diagram showing the establishing of a callsession for alarm system 104 using NCS ID1. The example of FIG. 5assumes that call handling device 103 can establish up to threeconcurrent call sessions, that the premises 102 account is assigned TN1,TN2 and TN3 (NCS ID1, NCS ID2 and NCS ID3), and all NCS IDs areinitially available. As shown by lines 5-1 through 5-3, lines 5-4through 5-6, and lines 5-7 through 5-9, each of end devices 105-1through 105-3 has sent a signal to call handling device 103 requestingestablishment of a call session, with corresponding sessions beingestablished using NCS ID1, NCS ID2 and NCS ID3. At line 5-10, and whilecall sessions using NCS ID1 through NCS ID3 are ongoing, alarm system104 is triggered and sends a signal to call handling device 103indicating a request to establish a call session. Because the signal wasreceived over interface 106A, processor 201 of call handling device 103initially associates the signal with NCS ID1 (line 5-11). At line 5-12,call handling device 103 determines that NCS ID1 is in use and that noother NCS IDs are available. Call handling device 103 drops the callsession of end device 105-1 using NCS ID1 at lines 5-13 and 5-14. UsingNCS ID1, call handling device 103 establishes a call session for alarmsystem 104 at lines 5-15 and 5-16.

In other embodiments, a call handling device may be similar to callhandling device 103 of FIGS. 1 and 2, but instead be configured toperform call setup and other call handling procedures in accordance withSession Initiation Protocol (SIP). In at least some such embodiments, aunique SIP URI (uniform resource identifier) is assigned to each enddevice (including the alarm system) and used when a call session isestablished. In some such embodiments, multiple end devices in a localnetwork can participate in concurrent sessions using the same TN. Ineach of those sessions, the URI of each end device participating in thesession is inserted into the SIP “From” address field by the callhandling device. Elements within the external network then set up theconcurrent call sessions such that each is associated with the same TN.Thus, the alarm system could participate in a first session using aparticular TN (with the URI of the alarm system in the SIP “From”address field) and other end devices could participate in concurrentsessions using the same TN (with URIs of the other devices inserted intothe SIP “From” address fields in those other sessions).

If there is no limitation on the number of concurrent SIP call sessionsthat the call handling device in a local network could maintain (or ifthe maximum number of sessions has not been exceeded), and assuming thatan alarm system is not sharing an analog interface with another enddevice that has an ongoing call session, there would be no need to dropa SIP session of one end device to establish a SIP session for the alarmsystem. If there is a limitation on the number of concurrent SIPsessions, however, the local call handling device could be configured toperform operations such as are shown in FIG. 6A or 6B. The operations ofFIGS. 6A and 6B could be performed by a call handling device that issimilar to call handling device 103 of FIGS. 1 and 2. Such a callhandling device could have the same components shown in FIG. 2, exceptthat that the processor of such a call handling device could beconfigured to execute (and/or the memory of such a device could store)instructions for carrying out SIP-based operations such as shown in FIG.6A or 6B.

Turning to FIG. 6A, the processor of the call handling device receives asignal in block 601 indicating a request by an end device on aprioritized interface to establish a SIP session. In response, theprocessor proceeds to block 602 and determines if the number of currentSIP sessions exceeds a maximum. If not, the processor proceeds on the“no” branch to block 604 and allows the SIP session for the alarm systemto be established. If the call handling device corresponds to an accountthat has multiple TNs, the call session established in block 604 can(based on the alarm system URI in the SIP From field) be associated witha predetermined TN that is assigned to the alarm system. In this manner,the alarm monitoring company will receive caller identification datathat corresponds to that predetermined TN. If the maximum number of SIPsessions are ongoing, the processor instead proceeds on the “yes” branchto block 603 and drops one of those sessions. From block 603, theprocessor then proceeds to block 604 and allows the SIP session for thealarm system to be established using the URI of the alarm system. Othercall sessions may also be ongoing through other local communicationinterfaces of the call handling device, with such other call sessionsusing the same TN as the alarm system but involving devices havingdifferent URIs.

In some additional embodiments employing a SIP-based call handlingdevice, each of two analog interfaces such as interfaces 106A and 106Bof FIG. 1 could be assigned the same SIP URI. The call handling devicecould then be configured to prioritize a call session initiated over oneof those analog interfaces so as to drop a pre-existing call sessionover the other of those analog interfaces. FIG. 6B is a flow chartshowing operations by a processor in such an embodiment. In block 610,the processor of the call handling device receives a signal on aprioritized one of the two analog interfaces indicating a request toestablish a SIP session. The processor then determines in block 612 ifthere is a pre-existing call session over the other analog interface. Ifso, the processor proceeds to block 616 and drops the call sessionoccurring over the other analog interface. From block 616 the processorproceeds to block 615 (described below). If in block 612 the processordetermines there is no pre-existing call session over the other analoginterface, the processor proceeds to block 613 and determines if thenumber of current SIP sessions exceeds a maximum. If not, the processorproceeds on the “no” branch to block 615 and allows the SIP session tobe established over the prioritized analog interface using the SIP URIassigned to the analog interfaces. If the call handling devicecorresponds to an account that has multiple TNs, and as indicated abovein connection with FIG. 6A, the call session established in block 615can be associated with a predetermined TN that is assigned to the alarmsystem. If the maximum number of SIP sessions are ongoing, the processorinstead proceeds on the “yes” branch from block 613 to block 614 anddrops one of those sessions. From block 614, the processor then proceedsto block 615 and allows the SIP session to be established over theprioritized interface using the SIP URI assigned to the analoginterfaces. Other call sessions may also be ongoing through other localcommunication interfaces of the call handling device, with such othercall sessions using the same TN as the alarm system but involvingdevices having different URIs.

Other embodiments include numerous variations on the devices andtechniques described above. In some embodiments, for example, the localcall handling device is configured to establish a call session for analarm system using a specific TN (or a TN chosen from a few specifiedTNs) regardless of whether other TNs may be free. In some cases, forexample, an alarm company with which an alarm system attempts toestablish a call session may only recognize a specific TN (or a fewspecific TNs) as being associated with a particular premises. If anotherTN is used, the alarm company might be delayed in responding.

FIG. 7 is a flow chart showing operations performed by a processor of acall handling device in some such embodiments. The operations of FIG. 7could be performed by a call handling device that is similar to callhandling device 103 of FIGS. 1 and 2. Such a call handling device couldhave the same components shown in FIG. 2, except that the processor ofsuch a call handling device could be configured to execute (and/or thememory of such a device could store) instructions for carrying outoperations such as shown in FIG. 7. The example of FIG. 7 assumes thatthe call handling device employs NCS signaling and can establish callsessions using NCS ID1, NCS ID2 and NCS ID3, but that call sessions fromthe alarm system must use NCS ID1 or NCS ID2. The example of FIG. 7further assumes that three concurrent call sessions are allowed. Inblock 701, the processor receives a signal indicating that a device on aprioritized local interface (e.g., an interface such as interface 106Ain FIG. 2) is requesting that a call session be established. Inresponse, the processor determines if either of NCS ID1 or NCS ID2 isavailable. If so, the processor proceeds on the “yes” branch to block706 and selects the first of NCS ID1 or NCS ID2 that is available. Theprocessor then proceeds to block 705 and establishes a call session forthe device on the prioritized local interface using the selected NCS ID.If neither NCS ID1 nor NCS ID2 is available in block 702, the processorproceeds on the “no” branch to block 703 and drops the call session ofNCS ID1. The processor then proceeds to block 704 and selects NCS ID1.The processor then proceeds to block 705 and establishes a call sessionfor the device on the prioritized local interface using the selected NCSID.

FIGS. 8A and 8B show operations performed by a call handling device thatis also similar to (and has the same components as) call handling device103 of FIGS. 1 and 2, but in which the processor is configured toexecute (and/or the memory stores) instructions for carrying outoperations such as shown in FIGS. 8A and 8B. That call handling devicealso includes a first analog interface (similar to interface 106A ofFIGS. 1 and 2) that is prioritized and connected to an alarm system, aswell as a second analog interface (similar to analog interface 106B ofFIGS. 1 and 2) that is connected to an analog telephone. Beginning inblock 801 of FIG. 8A, the processor receives a signal indicating that adevice communicating through the first (prioritized) analog interface isrequesting that a call session be established. The processor proceeds toblock 802 and determines if a call session identifier (NCS ID1),corresponding to a telephone number (TN1) associated with the two analoginterfaces, is available. If so, the processor proceeds on the “yes”branch to block 804 and establishes a call session using NCS ID1/TN1.While that call session is ongoing, the second (non-prioritized) analoginterface is disabled and other devices (e.g., DECT handsets)communicating through other local communication interfaces cannot useNCS ID1/TN1. If in block 802 the processor determines that NCS ID1 isnot available, the processor proceeds on the “no” branch to block 803and drops the current call session using NCS ID1. That current callsession may be occurring over the second (non-prioritized) analoginterface, over another interface, or may be bridging the second analoginterface and a DECT (or other) interface. The processor then proceedsto block 804 and establishes a call session over the prioritized analoginterface using NCS ID1.

FIG. 8B shows operations performed by the processor of the same callhandling device in response to input over the second (non-prioritized)analog interface. In block 850, the processor receives a signal from thenon-prioritized analog interface indicating that a telephone or otherdevice connected to that interface has gone off-hook. In block 851, theprocessor determines if the prioritized analog interface is in use. Ifso, the non-prioritized analog interface is disabled and the processends on the “yes” branch. If the prioritized analog interface is not inuse, the processor proceeds to block 852 and determines if NCS ID1/TN1is in use for a call session over one of the other local interfaces. Ifso, the processor proceeds on the “yes” branch to block 853 and bridgesthe device connected to the non-prioritized analog interface into thatpre-existing NCS ID1/TN1 call session. If NCS ID1/TN1 is not in use, theprocessor proceeds on the “no” branch from block 852 to block 854. Inblock 854 the processor awaits further input (e.g., dialed numbers) andthen establishes a call session using NCS ID1.

A call handling device operating as shown in FIGS. 8A and 8B would beuseful, e.g., in connection with alarm systems that require a specificNCS ID and/or TN so that an alarm monitoring facility will receivecaller identification data associated with that specific NCS ID and/orTN.

FIG. 9 is a diagram of an environment in which at least some additionalembodiments may be implemented, and showing a local call handling device903 according to certain additional embodiments. Call handling device903 is similar to call handling device 103 of FIG. 1 and, except asdescribed below, has components similar to those of call handling device103. For example, device 903 includes a DECT interface 909 over whichdevice 903 communicates with handsets 905-1 through 905-n and a packetdata interface 911 for communication with external network 910. Unlikecall handling device 103, however, device 903 only has a single analoginterface 906 connected to an alarm system 904. Moreover, the processorof device 903 is configured to execute (and/or the memory stores)instructions for carrying out operations such as shown in FIG. 10A or10B.

For example, FIG. 10A shows operations performed when device 903 isconfigured to always drop pre-existing call sessions using a specificidentifier (NCS ID1/TN1) associated with interface 906 when alarm system904 is triggered. Beginning in block 1001, the processor of device 903receives a signal indicating the device on interface 906 is attemptingto initiate a call session. In block 1002 the processor determines ifNCS ID1 is in use for a pre-existing call session. If not (i.e., NCS ID1is available), the processor continues to block 1004 and establishes acall session over interface 906 using NCS ID1. If NCS ID 1 is notavailable, the processor proceeds from block 1002 on the “no” branch toblock 1003 and drops the pre-existing call session using NCS ID1. Theprocessor then proceeds to block 1004 and establishes a call sessionover interface 906 using NCS ID1.

FIG. 10B shows operations performed when device 903 is configured toonly drop pre-existing call sessions using a specific identifier (NCSID1/TN1) if no other identifiers are available. In block 1051 theprocessor receives a signal indicating the device on interface 906 isattempting to initiate a call session. In block 1052 the processordetermines if NCS ID1 is in use for a pre-existing call session. If not,the processor proceeds on the “no” branch to block 1053 and selects NCSID1. The processor then proceeds to block 1058 and establishes a callsession over interface 906 using the selected NCS ID (in this case, NCSID1). If in block 1052 the processor determines that NCS ID1 is alreadyin use, the process continues on the “yes” branch to block 1055 anddetermines if any other NCS IDs are free. If so, the processor continuesto block 1054 and selects a free NCS ID, and then continues to block1058. If in block 1055 the processor determines no other NCS ID is free,the processor continues to block 1056 and drops the pre-existing sessionusing NCS ID1. The processor selects NCS ID1 in block 1057 and thenproceeds to block 1058.

FIG. 11 is a diagram of an environment in which at least some additionalembodiments may be implemented, and showing a local call handling 1103device according to one such additional embodiment. Call handling device1103 is similar to call handling device 103 of FIG. 1 and, except asdescribed below, has components similar to those of call handling device103. For example, device 1103 includes a DECT interface 1109 over whichdevice 1103 communicates with handsets 1105-1 through 1105-n and apacket data interface 1111 for communication with external network 1110.Device 1103 similarly has an analog interface 1106A connected to alarmsystem 1104. Unlike call handling device 103, however, interface 1106Bis an interface (e.g., an RJ14 interface) that can simultaneous allowseparate call sessions over two separate lines 1121 and 1122. Forexample, first line 1122 could be connected to an analog telephone 1112engaged in a call session using NCS ID1/TN1 and second line 1121 couldbe connected to a fax machine 1107 engaged in a call session using NCSID2/TN2. In some embodiments, the processor of device 1103 is configuredto execute (and/or the memory of device 1103 stores) instructions thatcause device 103 to associate a specific call identifier (NCS ID1/TN1)with interface 1106A and first line 1122 of interface 1106B. Interface1106A is then prioritized relative to that associated identifier and thefirst line of interface 1106B in the same way that interface 106A isprioritized relative to its associated identifier (NCS ID1) andinterface 106B in the embodiment of FIGS. 1-3. A call session on thesecond line 1121 of interface 1106B would not be interrupted bytriggering of alarm system 1104 because line 1121 is assigned anidentifier (NCS ID2/TN2) other than the identifier (NCS ID1/TN1)associated with interface 1106A. Alternatively, interface 1106A could beprioritized relative to its associated identifier and the first line ofinterface 1106B in the same way that the first (prioritized) interfacein the embodiment of FIGS. 8A and 8B is prioritized relative to NCS ID1and the second (non-prioritized) interface. In this alternateconfiguration, a call session on the second line 1121 of interface 1106Bwould also not be interrupted by triggering of alarm system 1104 becauseline 1121 is assigned an identifier (NCS ID2/TN2) other than theidentifier (NCS ID1/TN1) associated with interface 1106A.

In some embodiments, one of the call handling devices described abovemay only be provisioned with a single telephone line (e.g., a single NCSID/TN). For example, an operator of a network providingtelecommunications services may charge a higher fee for additional callidentifiers/TNs, and a subscriber may not wish to pay a fee foradditional identifiers. Some such embodiments having two analoginterfaces could operate in a manner similar to that described above inconnection with FIGS. 8A and 8B. Some such embodiments having one analoginterface could operate in a manner similar to that described above inconnection with FIG. 10A.

Certain embodiments may include a call handling device such as isdescribed above, but that can be selectively provisioned so as todisable the prioritization of an analog interface. For example, callhandling device 903 in some embodiments includes programming by whichdevice can be selectively configured to disable an interfaceprioritization feature so as to not drop a pre-existing call session inresponse to an incoming signal on interface 906. Once device 903 isconfigured in this manner, device connected to interface 906 andattempting to establish a call session would not interrupt apre-existing call session of a DECT handset using a NCS ID/TN associatedwith interface 906. If a pre-existing call session is using the sessionidentifier associated with interface 906, a telephone connected tointerface 906 would simply bridge into that call session when thattelephone goes off-hook. The ability to disable the prioritizationfeature would permit use of interface 906 for normal telephony devicesin premises that do not have an alarm or otherwise do not need theprioritization functionality.

Returning to FIG. 2, and as previously indicated, some embodiments mayinclude a RJ31X connector or other line seizure device that connectsalarm system 104 and another analog device such as telephone 112 tointerface 106A. As between alarm system 104 and telephone 112, alarmsystem 104 will have priority and be able to seize the connection tointerface 106A from telephone 112. However, processor 201 will notdifferentiate between alarm system 104 or telephone 112 when a signalrequesting a call session is received over interface 106A. Accordingly,and assuming alarm system 104 is not triggered, telephone 112 also hasthe power to initiate prioritized call sessions. Such an arrangementcould be used, e.g., to create a “hotline” or other type of emergencycommunication system.

The above discussion of FIGS. 1-7 describes prioritizing a call sessionover an analog interface 106A relative to a call session over a secondanalog interface 106B and/or relative to a call session over a DECTinterface 109. In some embodiments, a call handling device may also beable to establish call sessions with end devices through USB, MoCA,WiFi, Ethernet and/or other types of interfaces. In some suchembodiments, the processor may also be configured to prioritize a callsession over one interface (e.g., analog interface 106A) relative topre-existing call sessions over any of those other interfaces.

Embodiments of the invention include a machine readable storage medium(e.g., a CD-ROM, CD-RW, DVD, floppy disc, FLASH memory, RAM, ROM,magnetic platters of a hard drive, etc.) storing machine readableinstructions that, when executed by one or more processors, cause a callhandling device or other device to carry out operations such as aredescribed herein. As used herein (including the claims), amachine-readable storage medium is a physical structure that can betouched by a human. A modulated signal would not by itself constitute amachine-readable storage medium.

Although some embodiments have been described in the context ofpacket-based telephony services provided over a coaxial cable, theinvention is not limited in this regard. Other embodiments includesystems in which a gateway or other device located within a premisescommunicates with an external network over some other type of physicalmedium (e.g., fiber optic cable, wireless transmission, twisted pair,etc.) using communications protocols other than those mentioned above.As but one example, a gateway or other device located at a subscriberpremises in some embodiments could communicate with an external networkusing a Digital Subscriber Line (DSL) access network. In some suchembodiments, the gateway is similar to that described above inconnection with FIG. 2, but with interface 111 replaced with DSLinterface hardware and with the processor configured to communicateusing appropriate DSL access network protocol(s). As but anotherexample, a gateway or other device located at a subscriber premises inother embodiments could communicate with an external network using aFiber to the Home (FTTH) Passive Optical Network (PON) access network. Agateway in some such embodiments is also similar to that of FIG. 2, butwith interface 111 replaced with PON interface hardware (or a connectionto a separate Optical Network Terminal (ONT)) and with the processorconfigured to communicate using appropriate access network protocol(s)(or communication protocol(s) for interfacing with an ONT).

The foregoing description of embodiments has been presented for purposesof illustration and description. The foregoing description is notintended to be exhaustive or to limit embodiments of the presentinvention to the precise form disclosed, and modifications andvariations are possible in light of the above teachings or may beacquired from practice of various embodiments. Additional embodimentsmay not perform all operations, have all features, or possess alladvantages described above. The embodiments discussed herein were chosenand described in order to explain the principles and the nature ofvarious embodiments and their practical application to enable oneskilled in the art to utilize the present invention in variousembodiments and with various modifications as are suited to theparticular use contemplated. The features of the embodiments describedherein may be combined in all possible combinations of methods,apparatuses, modules, systems, and machine-readable storage media. Anyand all permutations of features from above-described embodiments arethe within the scope of the invention.

The invention claimed is:
 1. A method comprising: receiving a requestfor a prioritized call session; determining, responsive to the requestand while at least a first call session identifier is available for useby a call-handling computing device, that a second call sessionidentifier and a third call session identifier are in use, wherein thesecond call session identifier and the third call session identifier areassociated with prioritized call sessions; and responsive to determiningthat the second call session identifier and the third call sessionidentifier are in use: dropping, by the call-handling computing device,a pre-existing call session that uses the second call sessionidentifier, and requesting, by the call-handling computing device, thatthe prioritized call session be initiated using the second call sessionidentifier.
 2. The method of claim 1, wherein at least one of thepre-existing call session and the prioritized call session is a voicecall session.
 3. The method of claim 1, wherein the receiving therequest comprises receiving, from a security system, the request.
 4. Themethod of claim 3, wherein the second call session identifier and thethird call session identifier correspond to telephone numbers associatedwith the security system.
 5. The method of claim 1, wherein therequesting that the prioritized call session be initiated comprisesrequesting that the prioritized call session be initiated via apacket-based telephony network.
 6. The method of claim 1, wherein thefirst call session identifier, the second call session identifier, andthe third call session identifier are associated with one of a pluralityof telephone numbers.
 7. The method of claim 1, wherein the first callsession identifier, the second call session identifier, and the thirdcall session identifier are telephone numbers.
 8. A method comprising:establishing, by a call handling computing device and using a first callsession identifier, a call session; receiving, during the call session,a request for a prioritized call session; responsive to the request,determining which of a first plurality of call session identifiersassociated with prioritized call sessions are in use; and responsive todetermining that all of the first plurality of call session identifiersare in use, and while at least a second call session identifier, not ofthe first plurality of call session identifiers, is available for use bythe call handling computing device: dropping the call session, andrequesting, by the call handling computing device, that the prioritizedcall session be initiated using the first call session identifier. 9.The method of claim 8, wherein the requesting that the prioritized callsession be initiated comprises sending, by the call handling computingdevice, data packets identifying the first call session identifier. 10.The method of claim 8, wherein the receiving the request comprisesreceiving, from a security system, the request.
 11. The method of claim8, wherein each of the call session identifiers of the first pluralityof call session identifiers and the second call session identifier isrespectively associated with one of a plurality of telephone numbers.12. The method of claim 8, further comprising establishing, via anetwork, the prioritized call session.
 13. A non-transitorycomputer-readable medium having stored thereon a plurality ofcomputer-executable instructions which, when executed by a processor,cause the processor to: receive a request for a prioritized callsession; determine, responsive to the request and while at least a firstcall session identifier is available for use, that a second call sessionidentifier and a third call session identifier are in use, wherein thesecond call session identifier and the third call session identifier areassociated with prioritized call sessions; responsive to determiningthat the second call session identifier and the third call sessionidentifier are in use, drop a pre-existing call session that uses thesecond call session identifier; and request that the prioritized callsession be initiated using the second call session identifier.
 14. Thenon-transitory computer-readable medium of claim 13, wherein thecomputer-executable instructions further cause the processor to:determine that the pre-existing call session corresponds to a firstservice; and determine that the prioritized call session corresponds toa second service.
 15. The non-transitory computer-readable medium ofclaim 14, wherein the second service comprises a security system relatedservice.
 16. The non-transitory computer-readable medium of claim 14,wherein the computer-executable instructions further cause the processorto: determine that the second service corresponds to a higher prioritythan the first service.
 17. The non-transitory computer-readable mediumof claim 13, wherein the computer-executable instructions that cause theprocessor to request that the prioritized call session be initiatedcomprise instructions that cause the processor to use a uniform resourceidentifier (URI) to request that the prioritized call session beinitiated.
 18. The non-transitory computer-readable medium of claim 13,wherein the computer-executable instructions that cause the processor torequest that the prioritized call session be initiated compriseinstructions that cause the processor to request that the prioritizedcall session be initiated via a packet-based telephony network.
 19. Thenon-transitory computer-readable medium of claim 13, wherein the firstcall session identifier, the second call session identifier, and thethird call session identifier are each associated with one of aplurality of telephone numbers.
 20. The method of claim 1, whereindropping the pre-existing call session comprises: determining that thepre-existing call session corresponds to a first service; anddetermining that the prioritized call session corresponds to a secondservice, wherein the second service is associated with a higher prioritythan the first service.